Catamaran



FIG. 1 is a side elevational view of a catamaran showing my new design, the opposite side view being a mirror image of that shown, and the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a top and rear perspective view thereof. 

The ornamental design for a catamaran, as shown and described. 